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From: Christoph Lameter <cl@linux.com>
To: Andreas Mohr <andi@lisas.de>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>,
	Andrew Morton <akpm@linux-foundation.org>,
	Pekka Enberg <penberg@kernel.org>,
	David Rientjes <rientjes@google.com>,
	linux-mm@kvack.org, linux-kernel@vger.kernel.org,
	Jesper Dangaard Brouer <brouer@redhat.com>
Subject: Re: [PATCH 6/6] mm/slab: allocation fastpath without disabling irq
Date: Tue, 6 Jan 2015 09:33:15 -0600 (CST)	[thread overview]
Message-ID: <alpine.DEB.2.11.1501060931500.31349@gentwo.org> (raw)
In-Reply-To: <20150106103439.GA8669@rhlx01.hs-esslingen.de>

On Tue, 6 Jan 2015, Andreas Mohr wrote:
> by merely queuing them into a simple submission queue
> which then will be delay-applied by main-context
> either once main-context enters a certain "quiet" state (e.g. context switch?),
> or once main-context needs to actively take into account

This is basically the same approach as you mentioned before and would
multiply the resources needed. I think we are close to be able to avoid
allocations from interrupt contexts. Someone would need to perform an
audit to see what is left to be done. If so then lots of allocator paths
both in the page allocator and slab allocator can be dramatically
simplified.

WARNING: multiple messages have this Message-ID (diff)
From: Christoph Lameter <cl@linux.com>
To: Andreas Mohr <andi@lisas.de>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>,
	Andrew Morton <akpm@linux-foundation.org>,
	Pekka Enberg <penberg@kernel.org>,
	David Rientjes <rientjes@google.com>,
	linux-mm@kvack.org, linux-kernel@vger.kernel.org,
	Jesper Dangaard Brouer <brouer@redhat.com>
Subject: Re: [PATCH 6/6] mm/slab: allocation fastpath without disabling irq
Date: Tue, 6 Jan 2015 09:33:15 -0600 (CST)	[thread overview]
Message-ID: <alpine.DEB.2.11.1501060931500.31349@gentwo.org> (raw)
In-Reply-To: <20150106103439.GA8669@rhlx01.hs-esslingen.de>

On Tue, 6 Jan 2015, Andreas Mohr wrote:
> by merely queuing them into a simple submission queue
> which then will be delay-applied by main-context
> either once main-context enters a certain "quiet" state (e.g. context switch?),
> or once main-context needs to actively take into account

This is basically the same approach as you mentioned before and would
multiply the resources needed. I think we are close to be able to avoid
allocations from interrupt contexts. Someone would need to perform an
audit to see what is left to be done. If so then lots of allocator paths
both in the page allocator and slab allocator can be dramatically
simplified.

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  reply	other threads:[~2015-01-06 15:33 UTC|newest]

Thread overview: 34+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-01-05  1:37 [PATCH 0/6] mm/slab: optimize allocation fastpath Joonsoo Kim
2015-01-05  1:37 ` Joonsoo Kim
2015-01-05  1:37 ` [PATCH 1/6] mm/slab: fix gfp flags of percpu allocation at boot phase Joonsoo Kim
2015-01-05  1:37   ` Joonsoo Kim
2015-01-05  1:37 ` [PATCH 2/6] mm/slab: remove kmemleak_erase() call Joonsoo Kim
2015-01-05  1:37   ` Joonsoo Kim
2015-01-08 12:01   ` Catalin Marinas
2015-01-08 12:01     ` Catalin Marinas
2015-01-05  1:37 ` [PATCH 3/6] mm/slab: clean-up __ac_get_obj() to prepare future changes Joonsoo Kim
2015-01-05  1:37   ` Joonsoo Kim
2015-01-05  1:37 ` [PATCH 4/6] mm/slab: rearrange irq management Joonsoo Kim
2015-01-05  1:37   ` Joonsoo Kim
2015-01-05  1:37 ` [PATCH 5/6] mm/slab: cleanup ____cache_alloc() Joonsoo Kim
2015-01-05  1:37   ` Joonsoo Kim
2015-01-05  1:37 ` [PATCH 6/6] mm/slab: allocation fastpath without disabling irq Joonsoo Kim
2015-01-05  1:37   ` Joonsoo Kim
2015-01-05 15:28   ` Christoph Lameter
2015-01-05 15:28     ` Christoph Lameter
2015-01-06  1:04     ` Joonsoo Kim
2015-01-06  1:04       ` Joonsoo Kim
2015-01-05 17:21   ` Andreas Mohr
2015-01-05 17:21     ` Andreas Mohr
2015-01-05 17:52     ` Christoph Lameter
2015-01-05 17:52       ` Christoph Lameter
2015-01-06  1:31     ` Joonsoo Kim
2015-01-06  1:31       ` Joonsoo Kim
2015-01-06 10:34       ` Andreas Mohr
2015-01-06 10:34         ` Andreas Mohr
2015-01-06 15:33         ` Christoph Lameter [this message]
2015-01-06 15:33           ` Christoph Lameter
2015-01-06 16:26           ` Andreas Mohr
2015-01-06 16:26             ` Andreas Mohr
2015-01-08  7:54         ` Joonsoo Kim
2015-01-08  7:54           ` Joonsoo Kim

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